<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box1,
        .box2 {
            width: 200px;
            height: 200px;
            border: 1px querySelector black;
            margin: 10px;
        }
        
        .box1 {
            /* 十进制的表达方式 */
            /* background-color: rgb(12, 56, 134);  */
            background-color: rgb( 32, 23, 123);
            /* background-color: rgb(255, 255, 255); */
        }
        
        .box2 {
            /* 十六进制的表达方式 */
            /* background-color: #0c3886; */
            background-color: #20177b;
            /* background-color: #ffffff; */
        }
    </style>
</head>

<body>
    <div class="box1"></div>
    <div class="box2"></div>
</body>

</html>